find the sum of first 19 terms of an a.p 2,7,12,17
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nyc hard question budddyyyy
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a=2 d=7-2=5 n=19
According to formula
Sn=n/2[2a+(n-1)d]
Sn=19/2[2×2+(19-1)5]
Sn=19/2[4+18×5]
Sn=19/2[4+90]
Sn=19/2[94]
Sn=19/2×94
Sn=19×47
Sn=893
According to formula
Sn=n/2[2a+(n-1)d]
Sn=19/2[2×2+(19-1)5]
Sn=19/2[4+18×5]
Sn=19/2[4+90]
Sn=19/2[94]
Sn=19/2×94
Sn=19×47
Sn=893
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