find the sum of first 22 term of an AP in which d=7 and 22nd term is 149
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Step-by-step explanation:
given d=7 a22 =149 s22=?
a22=a+21d
therefore ,a22 = 149
149 = a+21 × 7
149 = a+ 149
149-149 =a
a=0
s22= n /2(a+ an)
s22= 22/2(0+149)
s22=11×149
therefore ,
s22 = 1639
the sum of 1st 22 terms is 1639
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