The sum of first 7 terms of an AP is 63 and the sum of its next 7 terms is 161. Find the 28th term of this AP
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Answered by
2
Answer:
57
Step-by-step explanation:
S7=63
S14=63+161 =224
63=7/2[2a+6d]
2a+6d=18
224=14/2[2a+13d]
2a+13d=32
2a+6d=18
2a+13d=32
by solving, d=2 and a= 3
a28=a+27d
=3+27(2)
=3 + 54
=57
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0
Answer:
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