Question

8. Find 1+3+5+7+9 without actual addition.​

Answer 1

Answer:

25 is the answer

Step-by-step explanation:

sum of first 5 odd number = 25

we added first 5 numbers so 5²

and 5² = 25

25

Ans

Answer 2

Answer:

this sum forms AP

so,cd=2

no.of term=5

a=1

s=n/2{2a+(n-1)d}

5/2{2×1+(5-1)2}

5/2{2+8}

5/2×10

5×5=25

Step-by-step explanation:

i hope this is helpful for you