a=10 d=5 n=20 an=? sn =?
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Answer:
an will be 30 and sn will be 50
mark me as brainliest .
ranaharendrasingh409:
this is rong
no it's write
it's write
ok
ok
Answered by
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a = 10 , d = 5 , n = 20
tn = a + ( n-1 ) d
= 10 + ( 20-1 ) 5
= 10 + 19*5
= 10 + 95
= 105
Sn = n/2 ( 2a + ( n-1 ) d )
= 20/2 ( 2*10 + ( 20-1 ) 5 )
= 10 ( 20 + 19*5 )
= 10 ( 20 + 95 )
= 10*115
= 1150
tn = a + ( n-1 ) d
= 10 + ( 20-1 ) 5
= 10 + 19*5
= 10 + 95
= 105
Sn = n/2 ( 2a + ( n-1 ) d )
= 20/2 ( 2*10 + ( 20-1 ) 5 )
= 10 ( 20 + 19*5 )
= 10 ( 20 + 95 )
= 10*115
= 1150
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