The first term of an AP is 3, the last term is 83 and the sum of all its terms is 903. Find the numbers of terms and the common difference of the AP. 相关知识点: 试题来源: 解析 Now, a = 3l = 83S_n = 903We know,S_n=n/2[a+l]⇒ n/2[a+l]=903⇒ n/2[3+...
First term, a = S1 = 4(1) -(1)2=4-1= 3Sum of first two terms = S2= 4(2) -(2)2=8-4 = 4Second term, a2 =S2-S1 = 4 -3= 1Common difference, d=a2-a =1-3 =-2Nth term, an =a+(n- 1)d= 3 + (1-1)(-2)= 3-2n+2= 5- 2nTherefore, a3 =5-2(3) =...
Q.Ifa1,a2,a3,...anare first n terms of an A.P. with first terma1=0and common differenced≠0Then value ofa3−a2a2+a4−a2a3+a5−a2a4...an−a2an−1is Q.Ifa,a2,a3,...,anare firstnterms of an AP with first terma=0and common differenced≠0Then value ofa3−a...
The sum of first nn terms of an AP is given by Sn=4n2+nSn=4n2+n. Find that APAP. AcademicMathematicsNCERTClass 10Given: Sn=4n2+nSn=4n2+n To do: We have to find the AP. Solution: Let us take sum upto 1 term S1=4(1)2+(1)=4+1=5S1=4(1...
However, long-term studies of mode of first delivery in association with subsequent childbearing have reported lower rates of subsequent live births among women who delivered by cesarean, even after 10 or more years of follow-up.5,6 Conclusions Our data suggest that first delivery by cesarean is...
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Systemic chemotherapy with or without cetuximab in patients with resectable colorectal liver metastasis (New EPOC): long-term results of a multicentre, randomised, controlled, phase 3 trial. Lancet Oncol. 2020;21(3):398-411. doi:10.1016/S1470-2045(19)30798-3PubMedGoogle ScholarCrossref 30...
1 Some parents believe this increase in vaccine exposure is harmful to children, with specific concerns that early childhood immunization “overloads” the immune system and increases the risk for future infection.2 Based in part on this concern, an estimated 10% to 15% of parents are choosing...
Inclusion criteria were: (1) case-control design; (2) lack of prior exposure AP exposure; (3) clinically confirmed FEP in cases; (4) adult age (18–65); and (5) use of transcriptomics approaches in the respective studies. Exclusion criteria included: (1) absence of an unaffected ...