Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149. Solution:
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Answer:
THE REQUIRED
SUM IS = 1661
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Step-by-step explanation:
a22=149
a22=a+21d
149=a+21(7)
therefore,a=2
the sum of n terms in a.p
Sn=n/2[a1+an]
Sn=22/2[2+149]
Sn=11[151]
Sn=1661
Therefore sum of 22 terms in a.p is 1661
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