How many terms are added in 24+20+16+....to make the sum 72? In progressions
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72=n/2(24+(n-1)-4)
72=n/2(24-4n+4)
72=n/2(28-4n)
72=14n-2n2
2n2-14n+72
now use factories and solve it.....
72=n/2(24-4n+4)
72=n/2(28-4n)
72=14n-2n2
2n2-14n+72
now use factories and solve it.....
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