please help fast maths 1 SSC Board
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Step-by-step explanation:
In an AP
t1=-5
Sn=120
S45=120
Sn= n/2 [2a+(n-1) d]
S45= 45/2 [2(-5)+(45-1) d]
120=22.5 [-10+44d]
120/26= -10+44d
5+10=44d
15=44d
15/44= d
d=0.34
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