find the sum of first 25 th term of an a.p ? 2,5,8,...............25
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Answered by
1
Answer:
a=2
d=5-2=3
n=25
Sn=n/2(2a+(n-1)d)
S25=25/2(4+24×3)
=25/2×76=25×38= 950
Step-by-step explanation:
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Answered by
2
a=2
d=3
n=25
Sn=n [2a+(n-1)d]
2
=25 [2(2)+(24)(3)]
2
=25 [4+72]
2
=25 [76]
2
=1900
2
Sn=950
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