find the sum of 50 terms of the sequence 7,7.7,7.77,7.777,........
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an=a+(n-1)d this formula can help u for solve it
Answered by
1
a=7 d=0.7 n=50
sn=n/2 [2a+(n-1)d]
=50/2 [2×7+(50-1)×0.7]
=25 (14+34.3)
=127.5
hence sum of 50 terms is 127.5
sn=n/2 [2a+(n-1)d]
=50/2 [2×7+(50-1)×0.7]
=25 (14+34.3)
=127.5
hence sum of 50 terms is 127.5
manpreet50:
it's Ryt
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