Question

please tell me question no. 31!!!!!!​

Answer 1

Step-by-step explanation:

$\Huge\red{\mathfrak{ Answer }}$

31. m= (-28)+26+(-28)+26......(40 terms)

= (-2)+(-2)...(20 terms)

= (-2)(20)

= -40

n= 39+(-35)+39+(-35)....(40 terms)

= 4+4+.....(20 terms)

= 4(20)

= 80

m-n = -40-80= -(40+80)= -120

hope it helps ✌